Studies on the Susceptibility of Modified 9Cr-1Mo Steel to Stress Corrosion Cracking in Sodium Hydroxide Using Slow Strain Rate Testing Technique

Bharasi, N. Sivai; Toppo, Anita; Paul, V. Thomas; George, R.P.; Philip, John

doi:10.1007/s11665-020-04766-1

Cited by 6 publications

(1 citation statement)

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“…[ 9 , 10 , 13 , 14 , 15 , 16 ]. Accordingly, the following solutions have been widely used: solutions containing sodium hydroxide (NaOH) [ 17 , 18 , 19 , 20 , 21 , 22 ], sodium chloride (NaCl) [ 23 , 24 , 25 ], sulfate (SO 4 2− ), sulfite (SO 3 2− ), tetrathionate (S 4 O 6 2− ) and thiosulfate (S 2 O 3 2− ) [ 26 , 27 , 28 , 29 ], lead oxide (PbO) [ 30 , 31 , 32 ], and silicone compounds (SiO 2 , Na 2 SiO 3 ) [ 33 , 34 , 35 ]. Among them, NaOH solution has been frequently used to investigate the performance of SG tubing under impurity-concentrated crevice conditions.…”

Section: Introductionmentioning

confidence: 99%

On the Use of NaOH Solution to Simulate the Crevice Conditions of a Nuclear Steam Generator

Hur

Song²,

Han

et al. 2022

Materials

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The corrosion behavior and integrity of steam generator (SG) tube materials have frequently been tested in solutions containing sodium hydroxide (NaOH), assuming that NaOH is a typical contaminant concentrated in the crevices of SGs in a pressurized water reactor. The purpose of this study was to investigate the adequacy of using concentrated NaOH solutions to simulate the crevice environments of SGs. The dissolution behavior of magnetite deposit flakes formed in an operating SG was tested in a 0.4 wt.% NaOH solution at 300 °C, and the thermodynamic stability of magnetite was investigated using the potential-pH diagram for an iron–water system. The magnetite deposits were rapidly dissolved in the test solution, which was supported by the fact that magnetite is thermodynamically unstable under the test condition to dissolve to dihypoferrite ions (HFeO2−). These results indicate that research data obtained from concentrated NaOH solutions are not appropriate to apply to the crevice environments of SGs.

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